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public class MyStack {
	
	private int[] stack;
	private final int DEFAULT_CAPACITY = 10;
	private int sp; /* Stack Pointer */
	
	public MyStack() {
		stack = new int[DEFAULT_CAPACITY];
	}
	
	public MyStack(int capacity) {
		stack = new int[capacity];
	}
	
	public void push(int item) {
		stack[sp++] = item;
	}
	
	public int pop() {
		return stack[--sp];
	}
}

public MyStack()

MyStack¥¯¥é¥¹¤Î¥Ç¥Õ¥©¥ë¥È¤Î¥³¥ó¥¹¥È¥é¥¯¥¿¤Ç¤¹¡£¼¡¤Î¤è¤¦¤ËMyStack¥¯¥é¥¹¤Î¥¤¥ó¥¹¥¿¥ó¥¹¤ò¤Ä¤¯¤Ã¤¿¤È¤­¤Ë¸Æ¤Ó½Ð¤µ¤ì¤Þ¤¹¡£¤³¤Î¤È¤­¡¢¥¹¥¿¥Ã¥¯¤ÎºÇÂ祵¥¤¥º¤ÏDEFAULT_SIZE(=10)¤Ë¤Ê¤ê¤Þ¤¹¡£

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MyStack stack = new MyStack();

public MyStack(int size)

MyStack¥¯¥é¥¹¤Î¥³¥ó¥¹¥È¥é¥¯¥¿¤Ç¤¹¡£int·¿¤ÎÃͤò°ú¿ô¤Ë¤È¤ê¡¢¤½¤ì¤ò¥¹¥¿¥Ã¥¯¤ÎºÇÂ祵¥¤¥º¤Ë»ØÄꤷ¤Þ¤¹¡£Î㤨¤Ð¡¢¥¹¥¿¥Ã¥¯¤ÎºÇÂ祵¥¤¥º¤ò100¤È¤·¤¿¤¤¾ì¹ç¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Þ¤¹¡£

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MyStack stack = new MyStack(100);

public void push(int item)

int·¿¤ÎÃͤò°ú¿ô¤Ë¤È¤ê¡¢¤½¤ì¤ò¥¹¥¿¥Ã¥¯¤ËÀѤߤޤ¹¡£°Ê²¼¤Î¥³¡¼¥É¤Ï¥¹¥¿¥Ã¥¯¥Ý¥¤¥ó¥¿(sp : stack pointer)¤¬»Ø¤¹¾ì½ê¤Ø¥Ç¡¼¥¿¤ò³ÊǼ¤·¡¢¤½¤Î¸å¡¢¥¹¥¿¥Ã¥¯¥Ý¥¤¥ó¥¿¤ò¿Ê¤á¤Æ¤¤¤Þ¤¹¡£

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MyStack stack = new MyStack();
stack.push(10);
stack.push(20);
stack.push(30);

public int pop()

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MyStack stack = new MyStack();
stack.push(10);
stack.push(20);
stack.push(30);
System.out.println(stack.pop());
System.out.println(stack.pop());
System.out.println(stack.pop());
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30
20
10

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  1. Java¤Ç³Ø¤Ö¥Ç¡¼¥¿¹½Â¤ÆþÌç01¡Ý¥¹¥¿¥Ã¥¯(1/3)¡Ý´ðËÜÁàºî¤Î¼ÂÁõ¡Ê¤³¤Î¥¨¥ó¥È¥ê¡Ë
  2. Java¤Ç³Ø¤Ö¥Ç¡¼¥¿¹½Â¤ÆþÌç01¡Ý¥¹¥¿¥Ã¥¯(2/3)¡Ý¥¸¥§¥Í¥ê¥¯¥¹¤Î¼ÂÁõ
  3. Java¤Ç³Ø¤Ö¥Ç¡¼¥¿¹½Â¤ÆþÌç01¡Ý¥¹¥¿¥Ã¥¯(3/3)¡Ý¤µ¤é¤Ê¤ëÁàºî¤Î¼ÂÁõ

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